The Boston Journal of Philosophy and the Arts, 2권

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Cummings, Hilliard, & Company, 1825

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268 페이지 - A piece of zinc as large as a pea, or the point of a small iron nail, were found fully adequate to preserve forty or fifty square inches of copper ; and this, wherever it was placed, whether at the top, bottom, or in the middle of the sheet of copper, and whether the copper was straight or bent, or made into coils. And where the connection between...
384 페이지 - Dissolve in a copper kettle, by heat, one part of verdigris, in a sufficient quantity of pure vinegar, and add to it an aqueous solution of one part of white arsenic. A precipitate of dirty green generally forms, which must be renewed by adding more vinegar, or till the precipitate, is. perfectly dissolved. After boiling this mixture, a granular precipitate will in a short time form, of...
361 페이지 - ... were first adopted ; and the extension of vans in so short a time to places the most remote from the metropolis, induces a hope and expectation, that as roads improve the means of preserving them will improve also, possibly in an equal degree, so that permanence and consequent cheapness, in addition to facility of conveyance, will be distinguished features of the M'Adam system.
266 페이지 - I have shown that chemical attractions may be exalted, modified, or destroyed, by changes in the electrical states of bodies ; that substances will only combine when they are in different electrical states ; and that, by bringing a body naturally positive artificially into a negative state, its usual powers of combination are altogether destroyed...
549 페이지 - In the whole course of my geological travels," says Prof. Buckland, " from Cornwall to Caithness, from Calais to the Carpathians; in Ireland, in Italy, I have scarcely ever gone a mile without finding a perpetual succession of deposites of gravel, sand or loam, in situations that cannot be referred to the action of modern torrents, rivers or lakes, or any other existing causes. And, with respect to the still more striking diluvial phenomena of drifted masses of...
473 페이지 - The exponent of a in the first term is the same as the exponent of the power to which the binomial is raised, and it diminishes by one in each succeeding term.
244 페이지 - ... inches long, and 10 inches wide, be bent in the centre at an angle of about sixty degrees, and then put to stand on the two ends, we shall have the form of a plate No. 1. properly bent for the scaling oven. The operation of cleansing, as it is called, and which is preparatory to the process of scaling, is commenced by steeping the plates for the space of four or five minutes, in a mixture of muriatic acid and water, in the proportion of four pounds of acid to three gallons of water. This quantity...
268 페이지 - And where the connexion between different pieces of copper was completed by wires, or thin filaments of the fortieth or fiftieth of an inch in diameter, the effect was the same ; every side, every surface, every particle of the copper remained bright, whilst the iron or the zinc was slowly corroded. A piece of thick sheet copper, containing on both sides about sixty square inches, was cut in such a manner as to form seven divisions, connected only by the smallest filaments that could be left, and...
133 페이지 - ... the force of the wind. From the pass to camp the road was a moderate descent upon gravel, winding very much. Shipke is a large village in the small district of Rongzhoong, under the Deba or Governor of Chubrung, a town, or rather collection of tents, on the left bank of the Sutluj, eight marches to the eastward. The houses here, which are very much scattered, are built of stone and flat-roofed ; there are gardens before each, hedged with gooseberries, which gives them a neat appearance.
431 페이지 - ... account of its large mass. It is by the heat of the electric current, as well as by that disengaged from the air, condensed by the passage of the lightning through it when not conveyed by a good conductor, that buildings struck by it are frequently set on fire. No instance has yet occurred of an iron bar, of rather more than half an inch square, or of a cylinder of the same diameter, having been fused, or even heated red hot by lightning. A rod of this size would therefore be sufficient for a...

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